Loading...
Please wait, while we are loading the content...
Similar Documents
Crack growth simulation and residual strength prediction in airplane fuselages
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Ingraffea, Anthony R. Wawrzynek, Paul A. Chen, Chuin-Shan |
| Copyright Year | 1999 |
| Description | The objectives were to create a capability to simulate curvilinear crack growth and ductile tearing in aircraft fuselages subjected to widespread fatigue damage and to validate with tests. Analysis methodology and software program (FRANC3D/STAGS) developed herein allows engineers to maintain aging aircraft economically, while insuring continuous airworthiness, and to design more damage-tolerant aircraft for the next generation. Simulations of crack growth in fuselages were described. The crack tip opening angle (CTOA) fracture criterion, obtained from laboratory tests, was used to predict fracture behavior of fuselage panel tests. Geometrically nonlinear, elastic-plastic, thin shell finite element crack growth analyses were conducted. Comparisons of stress distributions, multiple stable crack growth history, and residual strength between measured and predicted results were made to assess the validity of the methodology. Incorporation of residual plastic deformations and tear strap failure was essential for accurate residual strength predictions. Issue related to predicting crack trajectory in fuselages were also discussed. A directional criterion, including T-stress and fracture toughness orthotropy, was developed. Curvilinear crack growth was simulated in coupon and fuselage panel tests. Both T-stress and fracture toughness orthotropy were essential to predict the observed crack paths. Flapping of fuselages were predicted. Measured and predicted results agreed reasonable well. |
| File Size | 9055795 |
| Page Count | 189 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19990035833 |
| Archival Resource Key | ark:/13960/t2x39qn9q |
| Language | English |
| Publisher Date | 1999-03-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Crack Tips Fracture Mechanics Ductility Structural Reliability Computerized Simulation Plastic Deformation Aircraft Parts Residual Strength Crack Propagation Finite Element Method Tearing Stress Distribution Fatigue Materials Predictions Aircraft Reliability Nonlinearity Cracking Fracturing Fuselages Damage Flapping Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
